How do I fix my SVN checkout on my Jenkins Slave?
I had to remove the newer jar as well:
cd /var/lib/jenkins/plugins/subversion/WEB-INF/lib
mv svnkit-1.7.10-jenkins-1.jar /tmp
/etc/init.d/jenkins restart and it worked! Great Find!
Found the problem..
There was an old svnkit-1.3.6.1-jenkins-2.jar in C:\Program Files (x86)\Jenkins\plugins\subversion\WEB-INF\lib
Shutting down jenkins and deleting this file solved the issue.